Why does the hair dryer generate static electricity?

Any substance will generate static electricity. After the blower is heated, the air blown out dries, so static electricity is generated.

Static electricity is a kind of electrostatic charge. Static electricity is formed when an object or surface accumulates charges, which are divided into positive charges and negative charges, that is, electrostatic phenomena are also divided into positive charges and negative charges. Positive charges gather on objects to form positive static electricity, while negative charges gather on objects to form negative static electricity. However, whether it is positive or negative static electricity, when an electrostatic object touches an object with zero potential (grounded object) or an object with potential difference, charge transfer will occur, which is the phenomenon of spark discharge we see every day. In daily life, people often encounter this phenomenon: when they take off their clothes and sleep at night, they often hear crackling sounds in the dark, accompanied by blue light. They met and shook hands, and as soon as their fingers touched, they suddenly felt a sharp pain in their fingertips, which was shocking; When I get up in the morning to comb my hair, my hair tends to "float", and the more I manage it, the more chaotic it is.

The so-called static electricity is static charge or non-flowing charge (flowing charge forms current). Static electricity is formed when an object or surface accumulates charges, which are divided into positive charges and negative charges, that is, electrostatic phenomena are also divided into positive charges and negative charges. Positive charges gather on objects to form positive static electricity, while negative charges gather on objects to form negative static electricity. However, whether it is positive or negative static electricity, when an electrostatic object touches an object with zero potential (grounded object) or an object with potential difference, charge transfer will occur, which is the phenomenon of spark discharge we see every day. For example, when the weather is dry in winter in the north, the human body is prone to static electricity, and it will discharge when it comes into contact with others or metal conductors. People will feel tingling from electric shock, and sparks can be seen at night, which is why chemical fiber clothing rubs against human body and brings positive static electricity to human body. With basic physical knowledge, we know that rubber rods rub fur, rubber rods are negatively charged and fur is positively charged.

These positive static electricity have a certain impact on human health, but we can't generally think that all static electricity radiation is harmful to human body, and what is harmful to human body is positive static electricity radiation, and negative static electricity radiation is harmless to human body.